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一、前言无线遥测系统的根本任务是将被测数据经过采集、编码、调制,通过无线电波传送到远距离的接收端,在接收端经过解调、分路、处理向用户提供各种测量数据。在传输过程中不可避免地要受到外部和内部的噪声干扰。特别是在空间遥测的应用中,由于传输距离很远,在接收端接收到的信号非常微弱,有时甚至完全淹没在噪声中,因此,如何在噪声干扰的条件下有效地提取遥测信号,就是遥测接收端的首要任务。要从噪声中提取信号,就需要尽可能多地利用遥测信号的特征。由于信号特征的变化是有规律的、可以估计的,而噪声干扰
I. Introduction Wireless telemetry system’s fundamental task is to test the data collected, encoded, modulated, transmitted to the receiving end of long-distance radio waves, the receiver after demodulation, shunting, processing to provide users with a variety of measurement data . It is unavoidable to be disturbed by external and internal noise during the transmission. Especially in the application of space telemetry, the signal received at the receiving end is very weak and sometimes completely submerged in the noise due to the long transmission distance. Therefore, how to effectively extract the telemetry signal under the condition of noise interference is that telemetry Receiving the top priority. To extract a signal from noise, you need to make the most of the telemetry signal’s characteristics. As the signal characteristics of the changes are regular, can be estimated, and the noise interference